Yes, my yard fixed a bar (angle bar) that has 2 hole at each end. A hole is drilled in each hatch handle. The holes match up and a wind nut and bolt slides through, thus the two handles are locked close.

My experience with Atkins and Hoyle is that they do not sell an actual gasket, but the will provide a strip of gasket material of appropriate length to fit your hatch. I remember thinking it was a bit pricey, (but when it comes to boats that is true of just about everything). I forget whether they provided the adhesive, but if not, they can tell you what to use. The information I have in my computerized note file follows:
HATCH GASKETS - ATKINSON HOYLE - TOTONTO 416-596-1818 - ERIC ATKINS ;
UNIROYAL SILAPRENE 13X18 22X22 ACRYLIC

I have found the name of the manufacturer if anyone is interested.Atkins & Hoyle (atkinshoyle.com). This is probably commond knowledge for you guys up 'Nuth.
CVolpe - Maria - 32'